P. 12 - Inputs - Alarm input
Alarm input [Alin] (A+ / A-)
Through this input BANDIT is told the
alarm system or burglar
detector generates a burglar report.
If an alarm signal is offered through this input
(start pulse) , while the unit is in guard mode,
the BANDIT immediately will proceed to the
alarm mode (so starts fog ejection).
Properties of the "alarm mode":
4The red LED "Alarm" on the front panel goes on from the moment the alarm mode starts
and goes off as soon as the unit is put out of guard mode (see page 11 "guard mode").
4As soon as the "alarm mode" starts, also the fog expulsion starts (fog ejection time is
adjusted through dipblock C, see page 25). A running fog expulsion can only be interrupted
through deactivating the guard mode([Grdin] not active).
4If a fog expulsion period is terminated , a period of 3 minutes is added as “dead period”. A
new alarm pulse over [Alin1] after these 3 minutes , will start a new fog expulsion period.
See also page 21, under- temperature protection.
Configuration of the alarm input [Alin]:
Depending on the A2 dip switch position, the alarm input will start a fog expulsion with a
negative or positive edge transition (flank). As long as there is 12 V over this input, the red
PCB Led [AlinV] will be on.
Logical truth chart for the alarm input [Alin]:
0
Dip A2
ON
Dip A2
OFF
12 V
over
Alin
No power
supply
over
Alin
No power
supply
over
Alin
12 V
over
Alin
PCB LED
AlinV
Start
alarm
mode
On
Only with
positive
edge of
0 12V
Only with
negative
edge of
12V 0
No No
Off Off
On
ONON
11 22 33
Alin1V LED is on
as long as there is 12 V
over Alin
Extra pulses over
[Alin] during a fog expulsion
have no influence.
BANDIT 240 DB v.206
F
If an optional remote control is connected [Alin] will maintain its normal function.
So there can be also triggered a valid alarm pulse through remote control (ch1 and/or 2)
as through [Alin].
Also see page 25, Dip block B and Remote control.
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